CN101525808B

CN101525808B - Double-needle bed raschel type warp knitting machine

Info

Publication number: CN101525808B
Application number: CN2008101910583A
Authority: CN
Inventors: 海因里希·门策尔特
Original assignee: LIBA Maschinenfabrik GmbH
Current assignee: Karl Mayer Leigh Ba Textile Machinery Manufacturing Co ltd; Karl Mayer Technical Textiles Co ltd
Priority date: 2007-08-23
Filing date: 2008-08-22
Publication date: 2011-08-24
Anticipated expiration: 2028-08-22
Also published as: CN101525808A; EP2028306A1; ES2342570T3; EP2028306B1; DE502007003317D1

Abstract

Two groups of weft shuttle magazines are configured for one double bar Rachel loom in order to manufacture spaced knitted fabrics for which the surface is reinforced through attached warp and/or warp. Two groups of longitudinal conveyors (13h, 13v) are subject to the two groups of the weft shuttle magazines. The two groups of longitudinal conveyors (13h, 13v) move mutually in opposite movement direction (36h, 36v). Moreover, the two groups of longitudinal conveyors (13h, 13v) pass horizontal yarn feeding areas (14h, 14v) placing the weft in turn, then pass the slightly oblique feeding areas (15h, 15v), strongly oblique first returning areas (16h, 16v), finally pass the other returning areas (17h, 17v) of the longitudinal conveyors (13h, 13v). The invention is characterized in that the movement rails of the two pairs of the longitudinal conveyors (13h, 13v) mutually pass and form one puncturing area (38). Moreover, the movement rails of the two pairs of the longitudinal conveyors (13h, 13v) cross at a deflection position (39h, 39v) between the slightly oblique feeding areas (15h, 15v) and the strongly oblique first returning areas (16h, 16v). The crossing position is located on a knitting position of the double bar Rachel loom. The compact building mode is realized through the design, wherein the weft can be conveyed to the knitting position in a larger speed through the weft shuttle magazines, thus the double bar Rachel loom with the building mode has higher production speed.

Description

Double needle bar raschel type warp knitting machine

Technical Field

The invention relates to a double-needle bed Raschel type warp knitting machine for producing a spacer knitted fabric, comprising a knitting position at which warp yarns, knitting yarns and pile yarns introduced into a yarn guide needle are matched with opposite knitting needles and a generated spacer fabric width is formed and output between two guide bars, and a weft yarn feeding device which is opened to an area between the yarn guide needle and a needle row of the knitting needle at two sides of the knitting position, wherein weft yarns are respectively knitted into an upper layer of the spacer knitted fabric generated at one side of the feeding device.

Background

Spacer knits have long been known under the name "wool; it consists of two fabric layers which are connected to each other by pile yarns. Methods for producing double-layer plush knits are known, in which a textile web is cut off in the longitudinal direction by means of a shearing blade and a velour knit is produced, as well as the use of full spacer knits for clothing, upholstery and netting (see company brochure from LIBA machine manufacturing ltd on double needle bar raschel warp knitting machine DGDPLM). In the clothing system, the spacer knit allows for the adjustment of the microclimate (see mellidand-textile report by k. machowa, g. hoffmann and c. cherif, page 818/819).

In addition, engineered spacer knits with biaxial reinforced double knit surface are also proposed, wherein the knit surface is referred to as the cover side. The biaxial reinforcement is formed by warp yarns and/or ground yarns, which are additionally fed to the knitted fabric; here, a lattice structure is always advantageous. The covering surface will be held in place on the spacer by pile yarn supports, which results in a so-called spacer material or sandwich structure. A particularly noteworthy field of application is construction materials and cement products, such as light partition walls with spacer knits, which are used as sandwich panels, see the discussion of a.roye and th.gries on "warp practice" 2004, 3 rd, 26/27.

The above-mentioned discussion also refers to a single manufacturing process of a double needle bar raschel type warp knitting machine, which is used for scientific purposes and is considered in the present application as prior art. The double-needle bed raschel type warp knitting machine is characterized by its knitting unit, wherein one weft feeding element is provided on each side of the knitting position, which element is used to introduce 90 ° roving. Both the schematic diagrams and the short text in the discussion of a.roye and th.gries do not guarantee a reliable deduction of the technical details of the weft feeding element applied here.

For warp knitting machines for the mass production of flat fabrics, the process of feeding weft threads into a knitting position in a so-called shuttle magazine system is already known. Here, the advancing weft thread is placed on endless longitudinal conveyor belts (generally conveyor chains) arranged in pairs and temporarily held there. The weft threads can be fed continuously as a stretched thread bundle or as individual threads to a longitudinal conveyor belt or can be temporarily stored as an endless thread bundle or as individual threads, for which purpose the thread guides can be used in conjunction with a shifting rake. The shuttle magazine system allows the warp knitting machine so designed to operate at higher speeds.

With a warp knitting machine of the type described above, such as according to DE 19816440C 1, the longitudinal conveyor belt is conveyed in the horizontal direction to the knitting position of the warp knitting machine with the weft thread placed on top of the longitudinal conveyor belt, and after the weft thread is discharged the empty conveyor belt continues in the horizontal direction unchanged until it turns and feeds back. The ground warp is transported from above and obliquely downward through the knitting station, wherein the finished flat fabric also has the same direction first, provided that it is transported through the warp knitting machine and then out of the warp knitting machine. Above the longitudinal conveyor belt, which is conveyed through the knitting station, there are also arranged yarn guides with warp yarns, below which there are movably placed hooks for sliding needles, locking turn flats and weft preset flats (see above, in particular fig. 4 and 10). Warp knitting machines of this known construction form for producing flat fabrics have proven themselves in practice and are capable of achieving high throughputs in reliable continuous operation. However, there is a major design problem by gathering many moving parts in the knitting location area; it is not certain how the known embodiments, in particular with a weft shuttle magazine, can be considered for the economical production of spacer knitted fabrics.

Disclosure of Invention

The object of the invention is therefore to provide a double-bed raschel warp knitting machine of the type mentioned above which is suitable for production and which enables the production of high-quality spacer knitwear with high operating speeds and good reliability in continuous production.

The above object is achieved by a unitary double needle bed raschel warp knitting machine. In this case, provision is made for the double-needle bed raschel type warp knitting machine to be arranged on both sides of the knitting position with a weft thread magazine having a thread transport device and a pair of endless longitudinal conveyors, wherein the weft threads placed on the longitudinal conveyors by the thread transport device are successively fed to the knitting position, so that the two pairs of longitudinal conveyors have opposite directions of travel, the paths of travel of which run in a vertical plane run past one another in certain regions and the knitting position of the double-needle bed raschel type warp knitting machine lies on the edge of the puncture region, wherein this region is surrounded by the two pairs of longitudinal conveyors.

For the double needle bed raschel type warp knitting machine according to the invention there are two pairs of endless longitudinal conveyor belts, the moving tracks of which pass each other in certain areas. The longitudinal conveyor belts run in opposite running directions to knitting positions on the edges of the puncture area, respectively. The prerequisite for a compact construction is thus achieved, and the devices and individual components necessary for the functioning of the knitting process can also be reliably positioned in terms of performance.

According to an advantageous embodiment, the path of movement of the longitudinal conveyor has a deflected position in the piercing area, in the sense that it is moved downwards at a greater angle of inclination. "move downward at a greater inclination" means that the inclination of the moving track increases continuously in the running direction. The moving track is turned downwards to a certain extent; if it is already tilted, the tilt is more intense after the deflected position. The movement paths of the two pairs of longitudinal conveyor belts should cross at exactly this deflection point or turning point, wherein the deflection point is located in the knitting position area.

According to a further advantageous embodiment, each longitudinal conveyor belt has in succession in its direction of movement firstly a horizontal feed region, in which weft threads are deposited, above which is a feed region which is slightly inclined with respect to the horizontal, above which is the already mentioned deflection position, and then a first return region which is strongly inclined with respect to the horizontal. The deflection location is located in the knitting location area, wherein the longitudinal conveyor belts cross at the deflection location.

By this particular arrangement, i.e. the arrangement of the transport chain in two stages inclined downwards towards the centre of the machine, on the one hand a sufficient construction space for the guide bar is created and on the other hand also a sufficient space for the placement of the gripping sinker holders. It is clearly advantageous for the knitting process if the weft thread is delivered from above. In this way, the weft threads move in a direction which approximates to the doffing direction, which also makes cutting easier, since the weft threads of the two machine zones move alternately relative to the cutting direction. Likewise, the outer weft threads can also be easily transported to the knitting location in this way.

With the double needle bed raschel warp knitting machine according to the invention, the longitudinal transport belts of which run horizontally at the feed zone, it has proven to be advantageous if the angle of inclination of the feed zone with respect to the horizontal is between 6 ° and 20 °, preferably between 10 ° and 14 °, further preferably 12 °, and the angle of inclination of the first return zone with respect to the horizontal is between 35 ° and 55 °, preferably between 40 ° and 50 °, further preferably 45 °. These values can be changed in case of changes in the machine arm parameters, for example if the feed area has been tilted for other reasons.

In order to allow the displacement paths of the two pairs of longitudinal conveyor belts to pass through one another in the vertical plane, it is advantageously provided that one pair of longitudinal conveyor belts has a smaller distance from the other pair of longitudinal conveyor belts.

In order to advantageously carry out the knitting process, a very advantageous embodiment of the double-needle bed raschel warp knitting machine according to the invention is furthermore provided in that a weft guide plate is arranged below the feed region of each longitudinal conveyor in the region of the knitting location, on which weft guide plate the supplied weft thread is wound up, stretched and tensioned; it is advantageous here that, below the weft thread guide plate, a holding sinker is moved back and forth in a controlled manner, which holding sinker is simultaneously used as a weft thread feeder by means of the thread clamping opening.

With this arrangement, it is possible to reliably unwind the weft thread at the end of a single knitting process and at the same time to feed the weft thread precisely to the knitting location, even if the available installation space is very small.

For the double-needle bed raschel warp knitting machine according to the invention, the selection of the correct needle is of particular interest. It is particularly advantageous if the knitting needle is designed as a latch needle with a spring latch, so that the latch of the latch needle is always pretensioned by the spring action into a lighter breaking position. In the forward movement of the latch needle, the elastic latch is actuated by a catching broken roving wire on the holding sinker in such a way that the latch is always reliably opened far. The elastic latch has the function that the latch is automatically taken down from the needle after being unwound. By removing the latch, the latch catch ends of the roving wires are arranged closer to, in particular deeper at, the hook. This design is another important design solution for achieving a simple construction.

Advantageously, a separating device is arranged on each side of the edge of the knitting station, which separates the weft threads of the two pairs of longitudinal conveyor belts at the time when the knitting process requires a separation. The separating device can be a separating plate or a separating device which can be acted on by heat depending on the material of the knitting yarns. It is decisive that one separating device on each edge of the warp knitted fabric web produced for the two pairs of longitudinal conveyor belts is sufficient. Here, the weft threads of the two pairs of longitudinal conveyor belts act alternately and at different positions of the dividing device with the dividing device.

Finally, it is advantageous for the driving of the longitudinal conveyors that each of them is driven by its own servomotor with a rear planetary transmission of the torque converter, wherein the turning of the longitudinal conveyors is effected individually by the connecting rod arrangements. Overall, this results in a precisely controllable drive and a space-saving transport of the longitudinal conveyor belt. By providing a special drive for the discharge of the produced spacer fabric in the form of a discharge roller set, the complicated double feed of weft threads is no longer associated with the discharge of the warp-knitted fabric web, wherein during the discharge of the warp-knitted fabric web two weft thread sets are integrated into the cover surface.

Drawings

The invention is explained in detail below in the examples with the aid of the figures. Wherein,

fig. 1 is a side view of a double needle bed raschel type warp knitting machine according to the invention and its belonging beam suspension bracket.

Fig. 2 shows the transport paths of two longitudinal belts on the raschel-type warp knitting machine according to fig. 1.

Fig. 3 shows an enlarged view of the knitting position of the raschel warp knitting machine according to fig. 1 and its individual knitting tools, but without the longitudinal conveyor belt.

Fig. 4 is an enlarged perspective view of the intersection area of two longitudinal conveyor belts at the knitting position.

Fig. 5 to 7 describe the function of the knitting tools on the double-bed raschel warp knitting machine according to the invention.

Fig. 8 is a perspective view of a spacer knitted fabric manufactured by the double needle bed raschel type warp knitting machine according to the present invention.

Detailed Description

Fig. 1 shows a side view of a double-needle-bed raschel-type warp knitting machine according to the invention, which is briefly referred to below as raschel-type warp knitting machine. The view is defined in appearance by a beam hanger bracket 1, which beam hanger bracket 1 surrounds the associated warp knitting machine 9 from three sides. Two

ground warp beams

2h and 2v, two

knitting yarn beams

3h and 3v and two pile yarn beams 4h and 4v are respectively arranged on the warp beam suspension bracket. The additional letters h and v here and in the following represent identical or mirror-image parts, which are constructed symmetrically on the rear side or front side of the warp knitting machine 9. Two

gaps

35h, 35v between the beam hanger bracket 1 and the warp knitting machine 9 can be clearly identified in fig. 1. An operator can enter the operative end of the warp knitting machine 9 through

such gaps

35h, 35 v.

The

ground warp threads

5h, 5v,

knitting threads

6h, 6v and pile

threads

7h, 7v are fed from

different warp threads

2h, 2v, 3h, 3v and 4h, 4v to a knitting position 10, where various threads are knitted by means of a warp knitting tool, see fig. 3. The delivery of the

weft threads

11h, 11v to the knitting position 10 is effected in a so-called shuttle magazine system. The two weft yarn magazines are shown in their entirety in fig. 1 with the

reference numerals

8h, 8 v; the weft shuttle magazine comprises endless

longitudinal conveyor belts

13h, 13v and

thread transferring devices

12h, 12 v. The weft threads marked 11h, 11v can also be recognized well in fig. 3 and 5 to 7.

The

weft threads

11h, 11v are transported to the knitting station 10 on endless

longitudinal conveyors

13h, 13v, which

longitudinal conveyors

13h, 13v are always arranged in pairs, are usually designed as conveyor chains and have fixing devices for the

weft threads

11h, 11 v. The running direction of the longitudinal conveyor is indicated by the directional arrows 36h, 36 v.

Thread transferring devices

12h, 12v are arranged above the

longitudinal conveyor belts

13h, 13v, the

thread transferring devices

12h, 12v being composed of a thread guide and a shifting rake. The

thread transport devices

12h, 12v can be designed according to the special advantages of the applicant's german patent application (L83208 DE).

Weft threads

11h, 11v are drawn off from

weft thread bobbins

8h, 8v by

thread transfer devices

12h, 12v and are placed on

longitudinal conveyor belts

13h, 13v arranged in pairs so as to be displaced perpendicularly to the longitudinal conveyor belts 13h, 13 v. In this way, the

weft threads

11h, 11v laid down on the

longitudinal conveyor belts

13h, 13v have a direction of movement perpendicular to the drawing plane in the description of fig. 1. The

weft threads

11h, 11v are temporarily fixed to the

longitudinal belts

13h, 13v by means of fixing hooks, clamping devices or the like, so that the

weft threads

11h, 11v are also fixed between the

longitudinal belts

13h, 13v with a certain mechanical longitudinal stress.

Weft threads

11h, 11v are supplied to the knitting station 10 on

longitudinal conveyor belts

13h, 13v in coordination with the knitting process. This means that the

longitudinal conveyors

13h, 13v do not operate at the same speed. According to the symmetrical construction of the raschel warp knitting machine according to the invention, two pairs of

longitudinal conveyors

13h, 13v are provided, the tracks of which pairs 13h, 13v intersect in the description of fig. 1 in the region of the knitting position 10 and are located in parallel adjacent positions in the partial region of the back-feed region (see fig. 2). In order to make the above description possible, it is necessary to make the front pair of longitudinal belts 13v have a different working width from the rear pair of longitudinal belts 13 h. In the illustrated embodiment, the pair of longitudinal conveyor belts 13v has a relatively smaller working width, as clearly illustrated in fig. 4.

For better identifiability, the conveying paths or the two moving tracks of the

longitudinal conveyors

13h, 13v are shown separately in fig. 2, wherein the other mechanical parts are removed (the slight displacement of the two moving tracks included in the figure is only used to distinguish the two tracks on the drawing, which is not present in the practical case). The figures shown will be described separately for the longitudinal conveyor belt 13v previously described. The conveying paths of the latter pair of longitudinal conveying belts 13h are arranged in respective mirror images; it is not necessary to use the additional letter h to specifically describe the figure number.

The endless longitudinal conveyor belt 13v moves around a direction of travel 36 v. Here, the longitudinal conveyor belt 13v passes through a horizontal feed region 14v, wherein the weft thread 11v is laid in a moving state from the feed unit 12v onto the longitudinal conveyor belt 13v at right angles to the direction of travel 39 v. A slightly inclined feed zone 15v is connected to the yarn feeding zone 14v, the feed zone 15v being inclined downwards at about 12 ° from the horizontal in the embodiment shown. Now, the weft yarn 11v reaches the knitting position 10, where the weft yarn 11v is doffed from the longitudinal conveyor 13 v. In the region of the knitting position 10, the path of the front longitudinal conveyor belt 13v is once again turned down and is connected to a strongly inclined first return region 16 v. The longitudinal conveyor belt 13v is here inclined by approximately 45 ° with respect to the horizontal. A further return area 17v is connected to the strongly inclined first return area 16v, the return area 17v being aligned first parallel and then slightly inclined again toward the front.

The

longitudinal conveyors

13h, 13v thus designed, due to their opposing penetration or overlapping, form a substantially triangular piercing area 38 with the path of movement of the

longitudinal conveyors

13h, 13v, the piercing area 38 being clearly shown in fig. 2 by the hatched area.

Below the knitting position 10, a draw-off roller group 18 is arranged, by means of which draw-off roller group 18 the warp knitted fabric web 19 of the produced spacer knit is discharged. The yarn tensioning element is indicated at 20. Here, the details of the structure may be well-known as a precondition. The raschel machine according to the invention operates with as identical a yarn tension as possible for the

weft yarns

11h, 11v during operation. Advantageously, the

thread transfer device

12h, 12v according to the german patent application (L83209DE) of the applicant is also provided.

Fig. 3 shows the knitting station 10 of fig. 1 in enlarged scale, with a single warp knitting tool, wherein the conveying paths of the

longitudinal conveyor belts

13h, 13v are not shown for a better visibility. Weft guides are designated 21h, 21v, on which

weft threads

11h, 11v are placed, which are transported on the

longitudinal conveyors

13h, 13v, provided that they are close to the knitting position 10.

Gripping sinker holders

22h, 22v are arranged below the weft

thread guide plates

21h, 21v, and gripping

sinkers

24h, 24v are fixed on the

gripping sinker holders

22h, 22v by means of gripping sinker holder frames 23h, 23 v. The

grip sinkers

24h, 24v are designed at their front ends as clamping

holes

25h, 25v for taking up the

weft threads

11h, 11 v. The holding

sinkers

24h and 24v further have catching ends of the

roving wires

37h and 37v for cooperating with the latch pins 29h and 29v of the latch needles 28h and 28 v.

The

bars

26h, 26v determine the pile height of the resulting spacer knit. The latch needles 28h, 28v fixed to the

hooks

27h, 27v and the moving

latches

29h, 29v of the latch needles 28h, 28v are also simultaneously operated along the guide bars 26h, 26 v. In addition, fig. 3 shows that the

hooks

30h, 30v are identified, two of which are laterally adjacent to each

hook

28h, 28v and are conducive to the shearing process, provided that the tails of the

weft threads

11h, 11v fixed to the

longitudinal belts

13h, 13v are separated. For the separation process, a separating plate 31 is used, which can also be replaced by a thermally acting separating device, depending on the wire material.

Three pairs of guide needle rows are arranged above the weft guide plates 21h and 21 v. They are

Ground warp

yarn guide needles

32h, 32v for

ground warp yarns

5h, 5v,

Knitting yarn guide

needles

33h, 33v for

knitting yarns

6h, 6v and

pile

yarn guide needles

34h, 34v for

pile yarns

7h, 7v,

the arrangement of the guide bars 26h, 26v, the thread-guiding

needles

32h, 32v, 33h, 33v, 34h, 34v and their function in cooperation with the holding

sinkers

22h, 22v are in this case substantially in accordance with the prior art, but with the great difference that the

weft threads

11h, 11v are continuously transported in two pairs from the

longitudinal conveyors

13h, 13v to the knitting station 10 in correspondence with the knitting process. For this purpose, the two pairs of

longitudinal belts

13v and 13h pick up the weft yarns alternately in the region of the knitting station 10 (i.e. in a position which always produces a greater spatial tension). The

longitudinal conveyor belts

13h, 13v must therefore have different working widths in order to be able to actually achieve staggered pick-up.

In addition, the moving tracks of all the

longitudinal conveyors

13h, 13v are turned down in the same manner at the interleaved acquisition position. The

longitudinal belts

13h, 13v are driven with the

weft thread

11h, 11v from both sides toward one another and into the knitting position 10 (

directional arrows

36h, 36v), and if the

weft thread

11h, 11v is wound onto the weft

thread guide plates

21h, 21v, the

longitudinal belts

13h, 13v are no longer filled with

weft thread

11h, 11v by the dividing plate 31 and therefore continue to run downward in the empty state after the folding. By turning over, the initially more slowly inclined state of the

longitudinal conveyors

13h, 13v changes in the

infeed areas

15h, 15v (see fig. 2) into a more steeply inclined state of the strongly inclined return area until a further turning over takes place and the normal or

other return area

17h, 17v begins.

The scale of the correlation can be better seen from the schematic perspective view according to fig. 4. The longitudinal conveyor belt is here shown together with its housing, the

weft threads

11h, 11v protruding from the sides of the housing. If the user can see how tight the space is when viewing fig. 1, 2 and 4, it is clear. In addition to the spatial tension of the knitting station 10 itself, the necessary space must also be provided for the weft

thread transport devices

12h, 12v, which are only schematically depicted in fig. 1. Substantial space savings without changing the reliability of the knitting process can also be achieved by using

latch needles

28h, 28v, the latches of which 28h, 28v are spring-loaded when open.

The knitting process will be described below, which is carried out at the knitting location 10 with the described knitting tool in combination with the

weft threads

11h, 11v being supplied from both sides. In addition, fig. 5 to 7 describe other stages of the knitting process.

As mentioned above, the delivery of the

weft threads

11h, 11v to the knitting position 10 is not effected with the speed of the

longitudinal conveyors

13h, 13v remaining the same. The

longitudinal conveyors

13h, 13v should be accelerated and delayed more periodically. Acceleration is effected in the course of the mesh formation in order to transport the

subsequent weft threads

11h, 11v to the knitting position 10 in time. On the other hand, when the latch needles 28h, 28v are disengaged, the associated

longitudinal transport belts

13h, 13v are delayed, so that the following

weft threads

11h, 11v are delayed by a certain amount, so that the

latches

29h, 29v of the latch needles 28h, 28v have sufficient space for the closing process. Therefore, even if the speed of the

longitudinal belts

13h, 13v is high, it is possible to work by the distribution of the tight fixing means (fixing hooks) on the

longitudinal belts

13h, 13v, and the amount of waste generated by the cut weft tail is small.

The

weft threads

11h, 11v arrive at the weft

thread guide plates

21h, 21v at precisely set time intervals in this way, the

weft threads

11h, 11v being folded over from the running track of the

longitudinal conveyor belts

13h, 13v and being tensioned and arriving at the edge of the weft

thread guide plates

21h, 21v facing the guide bars 26h, 26v (see front region of fig. 3). At the same time, the holding

sinkers

24h, 24v are moved under the weft

thread guide plates

21h, 21v and stay there until the preceding

weft thread

11h, 11v is guided into the

thread clamping holes

25h, 25v of the holding

sinkers

24h, 24v and is guided out therefrom. (front region of fig. 5 and 6).

The

hooks

27h, 27v with

latch needles

28h, 28v and hooks 30h, 30v are now in their lower position (front area in fig. 5). Now, the

sinker

24h, 24v is held and continues to move towards the middle of the machine; the

weft threads

11h, 11v are likewise conveyed from the weft

longitudinal conveyors

13h, 13v toward the middle of the machine with the aid of the

gripping sinkers

24h, 24v and finally lie on the other side of the latch needles 28h, 28v in the upward movement (see also the front region in fig. 6). The

hooks

27h, 27v with

latch needles

28h, 28v and hooks 30h, 30v continue their movement to their uppermost position, wherein the

latches

29h, 29v continue to open on the catching, broken ends of the

roving wires

37h, 37v holding the

sinkers

24h, 24v (see front area of fig. 7). The normal process of forming a mesh is followed.

Finally, the two dividing plates 31 separate the bound

weft threads

11h, 11v from the tails of the

weft threads

11h, 11v fixed on the

longitudinal conveyors

13h, 13 v. The separation process is assisted by the

hooks

30h, 30v which are adjacent to the

hooks

27h, 27v on the side, wherein the

hooks

30h, 30v catch the weft thread tails and feed the

weft threads

11h, 11v to the dividing plate 31.

Reference character comparison table

1 warp beam suspension bracket

2h, 2v ground warp shaft

3h, 3v knitting yarn shaft

4h, 4v pile yarn axis

5h, 5v warp yarns

6h, 6v knitting yarn

7h, 7v pile yarn

8h, 8v weft shuttle library

9 warp knitting machine

10 knitting position

11h, 11v weft

12h, 12v wire conveying device

13h, 13v longitudinal conveyor belt (conveying chain)

14h, 14v yarn feeding region

15h, 15v feed zone, slightly inclined

16h, 16v loop back region, strongly inclined

17h, 17v other loop back regions

18 cloth discharging roller set

19 warp knit fabric web

20 yarn tensioning device

21h, 21v weft yarn guide plate

22h, 22v holding sinker seat

23h, 23v hold sinker seat frame

24h, 24v holding sinker

25h, 25v yarn clamping hole

26h, 26v guide bar

27h, 27v hook

28h, 28v latch needle

29h, 29v latch

30h, 30v set of hooks

31 division plate and division device

32h, 32v ground warp yarn guide needle

33h, 33v knitting yarn guide needle

34h, 34v pile yarn guide needle

35h, 35v clearance

36h, 36v directional arrows

37h, 37v catching broken end roving steel wire

38 puncture area

39h, 39v deflection position

Claims

1. A double-needle bed Raschel type warp knitting machine for producing a spacer knitted fabric, the double-needle bed Raschel type warp knitting machine having a knitting position at which a warp, a knitting yarn and a pile yarn introduced into a guide needle are engaged with a knitting needle located opposite to the warp, the knitting yarn and the pile yarn and a fabric width of the resulting spacer knitted fabric is formed between two guide bars and output, and the double-needle bed Raschel type warp knitting machine further having weft yarn feeding devices opening to a working area between a guide row and a knitting row on both sides of the knitting position, wherein weft yarns are respectively knitted into a surface layer of the spacer knitted fabric produced on a side of the weft yarn feeding devices,

it is characterized in that the preparation method is characterized in that,

on both sides of the knitting position, a weft yarn shuttle magazine (8h, 8v) is arranged with a yarn advancing device (12h, 12v) and with a pair of endless longitudinal conveyors (13h, 13v), wherein weft yarns (11h, 11v) laid on the longitudinal conveyors (13h, 13v) by the yarn advancing device (12h, 12v) are continuously fed to the knitting position (10), such that the two pairs of longitudinal conveyors (13h, 13v) have opposite directions of travel (36h, 36v),

the moving tracks of the longitudinal conveyor belt running in vertical planes pass through each other in certain areas

And the knitting position (10) of the double-needle bed Raschel machine is located on the edge of a piercing area (38), wherein the piercing area is surrounded by the two pairs of longitudinal conveyor belts (13h, 13 v).

2. Double needle bed raschel machine according to claim 1, characterized in that said displacement tracks of said longitudinal belts (13h, 13v) have a deflection position (39h, 39v) in said piercing area (38), in the sense that the inclination of the displacement tracks increases continuously in the direction of travel, so that the displacement tracks of said two pairs of longitudinal belts (13h, 13v) cross in said deflection position and in that said deflection position (39h, 39v) is located in the area of said knitting position (10).

3. The double needle bed Raschel warp knitting machine as claimed in claim 2,

-the movement trajectory of said endless longitudinal conveyor (13h, 13v) extending on parallel vertical planes has, in sequence in its direction of motion (36h, 36v), the following segments: a) horizontal feed regions (14h, 14v) in which the weft threads (11h, 11v) are placed on longitudinal conveyor belts (13h, 13v) arranged in pairs, b) feed regions (15h, 15v) inclined at an angle of between 6 ° and 20 ° with respect to the horizontal, c) first return regions (16h, 16v) inclined at an angle of between 35 ° and 55 ° with respect to the horizontal, and d) further return regions (17h, 17v) establishing a connection with the feed regions (14h, 14 v);

-the movement tracks of the two pairs of longitudinal conveyors (13h, 13v) are crossed with each other, seen in the horizontal direction, at the deflection position (39h, 39v) where the infeed area (15h, 15v) of the longitudinal conveyors (13h, 13v) transitions into the first return area (16h, 16 v);

-the crossing position of the moving tracks of said two pairs of longitudinal conveyor belts is located in the region of said knitting station (10).

4. Double needle bed raschel knitting machine according to claim 3, characterized in that the angle of inclination of the feed zone (15h, 15v) with respect to the horizontal is between 10 ° and 14 ° and the angle of inclination of the first return zone (16h, 16v) with respect to the horizontal is between 40 ° and 50 °.

5. Double needle bed raschel knitting machine according to claim 4, characterized in that the angle of inclination of the feed zone (15h, 15v) with respect to the horizontal is 12 ° and the angle of inclination of the first return zone (16h, 16v) with respect to the horizontal is 45 °.

6. Double needle bed raschel machine according to any one of claims 1 to 4, characterized in that one pair of said longitudinal conveyor belts (13v) has a smaller pitch than the other pair of said longitudinal conveyor belts (13 h).

7. Double needle bed raschel warp knitting machine as claimed in any one of claims 3 to 5, characterized in that under the feed region (15h, 15v) of each of the longitudinal conveyor belts (13h, 13v) in the region of the knitting position (10) a weft guide plate (21h, 21v) is arranged, to which the delivered weft thread (11h, 11v) arrives, is turned over and tightened, and under the weft guide plates (21h, 21v) a holding sinker (24h, 24v) is controllably moved back and forth, which by means of a thread clamping hole (25h, 25v) is simultaneously used as a weft feeder.

8. Double needle bed raschel type warp knitting machine according to one of claims 1 to 5, characterized in that the knitting needles are designed as latch needles (28h, 28v), the latches (29h, 29v) of which are pretensioned by the effect of an elastic force against the opening of the latches and are controlled by catching broken roving wires (37h, 37v) on the holding sinkers (24h, 24v) against the complete opening of the latches.

9. Double needle bed raschel type warp knitting machine according to one of claims 1 to 5, characterized in that one dividing device (31) is arranged on each side of the edge of the knitting position (10), by means of which dividing devices the weft threads (11h, 11v) on the two pairs of longitudinal conveyor belts (13h, 13v) are divided during the knitting process.

10. Double needle bed raschel machine according to one of the claims 1 to 5, characterized in that each endless longitudinal conveyor belt (13h, 13v) is driven by its own servomotor with a torque converter rear planetary transmission, the turning of the longitudinal conveyor belts (13h, 13v) is effected by link means alone, and a specially driven set of draw-off rollers (18) is provided for the draw-off of the produced spaced knitted fabric.